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Composite sodium supplement additive and application thereof in sodium ion battery

A technology for compound sodium supplementation and additives, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of low energy density and poor cycle stability of batteries, and achieve improved industrialization process, low cost, and improved The effect of catalytic effect

Active Publication Date: 2021-07-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to achieve the above-mentioned purpose of the invention, the present invention provides the following technical scheme, as an improvement of the sodium ion battery positive electrode sodium supplement method of the present invention, the sodium salt in the sodium supplement additive is completely decomposed and decomposed when the sodium ion battery is charged for the first cycle. Sodium ions and carbon dioxide gas are released, and the carbon dioxide produced by decomposition can be removed in the formation stage, while the sodium ions produced by decomposition can effectively solve the problems of low energy density and poor cycle stability of the battery caused by the irreversible consumption of sodium ions

Method used

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  • Composite sodium supplement additive and application thereof in sodium ion battery
  • Composite sodium supplement additive and application thereof in sodium ion battery
  • Composite sodium supplement additive and application thereof in sodium ion battery

Examples

Experimental program
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Effect test

preparation example 2

[0060] Preparation example two Synthesis of Manganese Oxide / Carbon Catalyst

preparation example 1

[0061] Preparation Example 1α-MnO 2 Catalyst Synthesis

[0062] Dissolve 3mmol manganese sulfate monohydrate in 15mL deionized water to form A solution, and then dissolve 6mmol potassium permanganate in 15mL deionized water to form B solution. Both A and B are dissolved in a water bath at 90°C at a constant temperature for 2 After hours, pour liquid A into liquid B, ultrasonicate for 0.5 hours, then transfer the mixed liquid into a 100mL hydrothermal reaction kettle, keep it warm at 150°C for 8 hours, then cool it down to room temperature naturally, filter with suction, wash, and dry to obtain α-MnO 2 , where the BET specific surface area test, α-MnO 2 The specific surface area is 54m 2 / g.

preparation example 2

[0063] Preparation example 2α-MnO 2 / Synthesis of CNTs-OH catalyst

[0064] Get 0.2g hydroxylated multi-walled carbon nanotubes (long, specific surface area 174m 2 g) and 2g KMnO 4 Grind in a mortar first, then ultrasonically disperse in 60mL deionized water for 0.5 hours, then add 1mL concentrated sulfuric acid dropwise to the mixed solution, then stir in a water bath in an oil bath at 80°C for 2.5 hours, then cool naturally to room temperature, and filter with suction , washed and dried to obtain α-MnO 2 / CNTs-OH complex. Wherein, according to the thermogravimetric test, the loading of the active component (calculated as metal manganese) accounts for 48wt% of the catalyst.

[0065] After the BET specific surface area test, α-MnO 2 / CNTs-OH specific surface area reaches 198m 2 / g.

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Abstract

The invention provides preparation and application of a composite sodium supplement additive. The sodium supplement additive contains a metal oxide carbon catalyst and a sodium salt, and the metal oxide carbon catalyst is a compound of a metal oxide and a carbon substrate. The sodium salt in the sodium supplement additive is completely decomposed and releases sodium ions and carbon dioxide gas when the sodium ion battery is charged for the first circle, and the carbon dioxide generated by decomposition can be removed in the formation stage; and sodium ions generated by decomposition can effectively solve the problems of low battery energy density and poor cycling stability caused by irreversible consumption of the sodium ions.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and in particular relates to the preparation and application of a composite sodium supplement additive. Background technique [0002] Na-ion batteries have good application prospects in the field of large-scale energy storage due to their low cost. However, the formation of SEI film in the first cycle of Na-ion batteries will cause irreversible sodium consumption, which will greatly affect the long cycle life of Na-ion batteries. In order to solve the commercial application of sodium-ion batteries in the short term, the problem that needs to be solved urgently is how to improve the energy density of long-term cycle of sodium-ion full batteries. There are two main tasks: 1. Develop electrode materials with higher energy density; 2. Compensate the irreversible loss of sodium during the first cycle of charge and discharge in the sodium ion battery by means of sodium supplementation. However, s...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/054
CPCH01M10/4235H01M10/054Y02E60/10
Inventor 郭玉国何维环殷雅侠郭玉洁
Owner INST OF CHEM CHINESE ACAD OF SCI
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